GB1348786A - Apparatus and methods for assessing the length of a moving vehicle - Google Patents

Apparatus and methods for assessing the length of a moving vehicle

Info

Publication number
GB1348786A
GB1348786A GB1348786DA GB1348786A GB 1348786 A GB1348786 A GB 1348786A GB 1348786D A GB1348786D A GB 1348786DA GB 1348786 A GB1348786 A GB 1348786A
Authority
GB
United Kingdom
Prior art keywords
vehicle
length
counter
detector
loop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plessey Co Ltd filed Critical Plessey Co Ltd
Publication of GB1348786A publication Critical patent/GB1348786A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/015—Detecting movement of traffic to be counted or controlled with provision for distinguishing between two or more types of vehicles, e.g. between motor-cars and cycles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/06—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness specially adapted for measuring length or width of objects while moving
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
    • G01P3/66—Devices characterised by the determination of the time taken to traverse a fixed distance using electric or magnetic means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

1348786 Measuring the length of moving vehicles; road traffic signalling apparatus PLESSEY CO Ltd 14 May 1971 [5 June 1970] 27406/70 Headings G4H and G4Q Apparatus for measuring the length of a moving vehicle comprises a first counter 14 the output of which is related to the speed of the vehicle, a second counter 12 the output of which is related to the length and speed of the vehicle and a circuit 28 responsive to the two outputs for determining the length of the vehicle. A pair of inductive loops A, B are arranged in the path of the vehicle so that when a vehicle enters the loop A, a detector 8 enables the second counter 12 to start counting clock pulses from a generator 16. When the vehicle leaves the loop A, the detector 8 stops the counter which therefore has a count proportional to the sum of the vehicle length and the length L 1 of the loop A divided by the vehicle velocity. When the vehicle enters the loop A, the first counter 14 also starts to count and is stopped by the combined outputs of the detector 8 and a detector 10 when the detector 10 senses the entry of the vehicle into the loop B. Hence the count in the counter 14 is proportional to the known distance L 1 + L3 divided by the vehicle velocity and a line 36 may provide a digital speed indication. From a knowledge of the frequencies of the clock pulses fed to the two counters, the length of the vehicle is calculated and compared with a stored critical length to provide an output on a line 32 or 34 depending on whether the measured length is above or below the critical length.
GB1348786D 1971-05-14 1971-05-14 Apparatus and methods for assessing the length of a moving vehicle Expired GB1348786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2740670 1971-05-14

Publications (1)

Publication Number Publication Date
GB1348786A true GB1348786A (en) 1974-03-20

Family

ID=10259058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1348786D Expired GB1348786A (en) 1971-05-14 1971-05-14 Apparatus and methods for assessing the length of a moving vehicle

Country Status (1)

Country Link
GB (1) GB1348786A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2480973A1 (en) * 1980-04-21 1981-10-23 Electronique Vehicules Reseaux ROAD SIGNALING DEVICE FUNCTION OF SPEED AND DIMENSIONS OF VEHICLES
MD374C2 (en) * 1986-04-11 1996-05-31 Basf Aktiengesellschaft Process for tablets obtaining

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2480973A1 (en) * 1980-04-21 1981-10-23 Electronique Vehicules Reseaux ROAD SIGNALING DEVICE FUNCTION OF SPEED AND DIMENSIONS OF VEHICLES
EP0038539A1 (en) * 1980-04-21 1981-10-28 L' Electronique des Véhicules et des Réseaux EVR ALCATEL Arrangement for road signalling dependent on the speed and dimensions of the vehicle
MD374C2 (en) * 1986-04-11 1996-05-31 Basf Aktiengesellschaft Process for tablets obtaining

Similar Documents

Publication Publication Date Title
GB1171832A (en) An Arrangement for Measuring the Density of Automobile Traffic
GB1354581A (en) Record tape position sensing
GB1405018A (en) Measuring fuel comsumption
GB1348786A (en) Apparatus and methods for assessing the length of a moving vehicle
US4922447A (en) Device for measuring the distance travelled and the speed of a rail vehicle
ES436332A1 (en) Vehicle coast control system
ATE14262T1 (en) EVALUATION CIRCUIT FOR A DIGITAL SPEED TRANSMITTER.
ES446820A1 (en) Speed limit display system for vehicles
GB1351311A (en) Apparatus for measuring or indicating movement by encoding and counting
GB1192025A (en) A Method of and Apparatus for Detecting Traffic Delay
GB1272534A (en) Apparatus for detecting traffic information
ES464209A1 (en) Train indicator system using axle detectors - has auxiliary circuit to correct false indication due to count errors
GB1215845A (en) A measuring device
GB1281339A (en) Improvements in the measurements of twist in rotating shafts
GB1271645A (en) Road vehicle acceleration meters
US3501763A (en) Method of measuring the spacing of two moving vehicles and a device for the performance thereof,and their application to the evaluation of the traffic density of vehicles
JPS57111864A (en) Tape length display device
GB1595071A (en) Length measuring apparatus
GB924205A (en) An installation by which is obtained a measurement which represents the acceleration of a railway vehicle
SU1045157A1 (en) Signal phase shift measuring device
SU391482A1 (en) DEVICE FOR MEASUREMENT
GB1069302A (en) Improvements in or relating to road traffic sensing apparatus
GB1062002A (en) Position determining apparatus for vehicles travelling on a track
JPS5377593A (en) Trouble detector of banknote examining apparatus
GB1278527A (en) Device for measuring and recording the relative spacing and speed of objects passing a fixed point

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee